Air quality in Chuo, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Chuo, Japan

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Chuo is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 17.0 µg/m³ based on nine valid observations.

Data are shown via OpenAQ and reflect the latest available readings for this location. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The OpenAQ feed for Chuo currently provides data on six key pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), combined nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). In total the dataset contains 19 individual measurement rows drawn from four monitoring stations, though the distribution of those rows is uneven across the pollutants. CO is represented by a single recent record from a station in Chiyoda‑Kōen dated 2025‑08‑28 05:00 UTC, while SO₂ appears in two rows both recorded on 2026‑02‑10 22:00 UTC at a site in Harumi. The nitrogen‑oxide family (NO, NO₂ and NOX) each have four recent entries from the same location in Shin‑kawa, all updated within three days of the reference date, and PM2.5 also has four fresh rows from that site with the latest timestamp on 2026‑02‑10 22:00 UTC.

Across the pollutants the most recent data are generally very current – every NO, NO₂, NOX and PM2.5 reading was logged on 2026‑02‑10, meaning the newest values are less than two days old at the time of writing. By contrast, CO’s only entry is older by about six months, and there are no measurements for any of the other pollutants beyond those listed, leaving gaps in temporal coverage for certain compounds.

The numeric spread shows modest variability: NO ranges from 0.004 to 0.009 ppm with a median of 0.0055 ppm; NO₂ varies between 0.018 and 0.033 ppm (median 0.028 ppm); NOX spans 0.022–0.040 ppm (median 0.0345 ppm). PM2.5 values sit between 7.0 and 17.0 µg/m³, centered around a median of 14.5 µg/m³, while SO₂ is constant at 0.001 ppm across its two records. These figures illustrate that while the dataset captures recent snapshots for most pollutants, coverage is limited to a handful of locations and some compounds (notably CO) rely on older observations, so conditions can differ across neighborhoods and times not represented here.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The data shown for Chuo reflects nine valid measurements and was updated within three days, with the latest refresh recorded at 2026‑02‑10 22:00 UTC. This snapshot provides a recent view of ambient air quality but should be interpreted as an overview; conditions can differ across neighborhoods and change throughout the day.

OpenAQ station rows